## Defects in solids |
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All solids, even the most ‘perfect’ crystals contain defects. Defects are of great importance as they can affect properties such as mechanical strength, electrical conductivity, chemical reactivity and corrosion. There are several terms used to describe defects which we must consider:
Every solid has a thermodynamic tendency to acquire point defects, as they introduce disorder and therefore increase entropy. |
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The Gibbs free energy, G = H – TS, of a solid, is contributed to by the entropy and enthalpy of the sample (fig. 14). Entropy is a measure of disorder within a system, hence, a solid with defects has a higher entropy than a perfect crystal. |

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